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Rajun, I think the location has a lot to do with what kind you want to use.

I have bought from Farmtek before and for a super deal, check out their remnants section. Cheap! Since they custom make units for big big greenhouses, they end up with lots of pieces like 10x60 and such. They list the availability on the website.

I've used 70% for the past 3 years, but my tomato patch is around 6,000 ft above sea level and my temps get over 100° very often with very very low humidity. My elevation causes higher solar radiation and the low humidity really kills the flowers, so the 70% shade cloth lowers temps up to 10° which enhances my chances for flowering a little bit. I install the shade cloth in June and take it off in early September. It saved me from some nasty hail this last season, although I was hit by a late hail storm in October.

Greenhouse megastore is reliable and has a great many useful items to garden growers. Just be sure to check out shipping cost when ordering. Not saying it is high, just something that must be considered.

I used a ground cover for 2 years.I found that water does not soak though fast enough so your plants re not going to get the water they need unless it rains for hours.I have now gone to straw at least 6 to 12 inches deep.You have few weeds and the straw breaks down and goes into the soil.Great thing is water penetration and plenty of worms.

If I could keep Bermuda from taking over I'd use straw/mulch, but since it was obviously created by Satan just to torture me I have to use plastic and this year I'm adding 6oz weed fabric to my paths and all around my garden.

The bees will come but it seems to me when they leave that they always fly up and usually get to the top and just buzz around till they die, some do make it out. It would be better to have just a cover and not any plastic or shade cloth below the roof line.

Nothing seemed to grow properly, long Lankly little blossoms and little fruit, esp tomato plants. Changed out the top fiberglass with new clear and lost the shade cloth, great results. I originally used the cloth to lower the temp but it really did not do a good job. More vent fans did that trick.